/**
 * Copyright (c) 2015-2019, Michael Yang 杨福海 (fuhai999@gmail.com).
 * <p>
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.jboot.db.model;


import java.util.LinkedList;
import java.util.List;

class Util {

    static final Object[] NULL_PARA_ARRAY = new Object[0];

    static Object[] getValueArray(List<Column> columns) {

        if (columns == null || columns.isEmpty()) {
            return NULL_PARA_ARRAY;
        }

        List<Object> values = new LinkedList<>();

        for (Column column : columns) {
            Object value = column.getValue();
            if (value == null || !column.isMustNeedValue()) continue;
            if (value.getClass().isArray()) {
                Object[] vs = (Object[]) value;
                for (Object v : vs) values.add(v);
            } else {
                values.add(value);
            }
        }

        return values.isEmpty() ? NULL_PARA_ARRAY : values.toArray();
    }
}
